Study on thermal property of heteropolyacids with keggin structure

Abstract

In this paper, the thermal stability of heteropolyacids with Keggin struc ture HnXM12O40 (X=Si, P, Ge; M=Mo, W) were studied systematically by DSC, TG-DAT, X-ray diffraction, IR spectra at various temperatures and solubility experimental methods. The new criterion of thermal decomposition for heteropoly compounds was proposed. The mechanism of thermal decomposition for heteropolyacids with Keggin structure was presented. A semi-empirical equation being used to predict the thermal decomposition temperatures was obtained. The reaction order and activation energy in every step of loss weight was calculated.

Key words: INFRARED SPECTROPHOTOMETRY, HETEROPOLYACID, X-RAY DIFFRACTION ANALYSIS, THERMAL STABILITY, TUNGSTIC ACID, DIFFERENTIAL SCANNING CALORIMETRY, THERMOGRAVIMETRY, SILICIC ACID, MOLYBDIC ACID

CLC Number:

O612

Cite this article

WANG ZUOPING;NIU JINGYANG;XU LIN;PENG JUN;WANG ENBO. Study on thermal property of heteropolyacids with keggin structure[J]. Acta Chimica Sinica, 1995, 53(8): 757-764.

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Keggin结构杂多酸热性质研究